Lowes offers Black + Decker 2.4-Amp Orbital Corded Sander for $21 (Reg $43). Free shipping on orders over $25. 

Product Description:
A compact design gives the 5-inch Random Orbital Sander the ability to sand in tight spaces. A high-performance dust collection system keeps your workspace clean. With paddle switch actuation, this sander is comfortable and easy to use.

• Paddle switch for natural sander actuation
• The compact and ergonomic design helps to provide control and accessibility in smaller spaces
• High-performance dust collection to provide a clean work surface
• Hook and loop system for easy paper changes
• Applications include Removing paint and stain or varnish from wood, metal, or plastic, surface preparation for finishing projects, shaping wood
• Includes (1) BDERO600 Sander, (1) Sheet Sandpaper, (1) Dust Bag